One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,6)(5,7)(9,10)(11,15)(12,16)(13,14)(18,23)(19,26)(22,25)(24,30)(27,28)(29,32) involution — undirected(1,3,5,4)(2,6,7,8)(10,14)(11,12)(17,18)(19,27)(20,22)(21,23)(24,29)(25,31)(26,30)(28,32)(9,11,13,12)(10,15,14,16)(17,19)(18,24)(20,30)(21,29)(22,32)(23,27)(25,26)(28,31)(1,4,5,3)(2,6,7,8)(11,12)(15,16)(17,20)(18,25)(19,28)(21,31)(22,23)(24,32)(26,27)(29,30)(9,12,13,11)(10,16,14,15)(18,23)(20,31)(24,27)(28,30)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.